table value parameters for store procedure

I use c# , .net core and oracle database. I want to pass data value parameter to stored procedure.

 using (var db = new AppDbContext())
 {
       return db.QueryProc<RetType>("pkg_test.sp_test_2",
           new DataParameter() { Name = "ip_obj", DataType = DataType.Structured,  Direction = 
           ParameterDirection.Input, Value = CreateDataTable() }).ToList();
   }

where i use DataTable created by this method:

        private static DataTable CreateDataTable()
        {
            DataTable table = new DataTable();
            table.Columns.Add("num ", typeof(int));
            table.Columns.Add("var ", typeof(string));

            table.Rows.Add(  1, "a" );
            table.Rows.Add( 2, "b" );
            return table;
        } 

I get error: “Value does not fall into expected range”. Does table value parameters supported for Oracle provider?

[MaceWindu]

@jods4 could you look at it after you are back?

[MaceWindu]

There were no progress made with this feature so I doubt it will work for any direction